/
manager.go
290 lines (250 loc) · 6.34 KB
/
manager.go
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// SPDX-FileCopyrightText: 2018 - 2022 UnionTech Software Technology Co., Ltd.
//
// SPDX-License-Identifier: GPL-3.0-or-later
package main
import (
"errors"
"fmt"
"log"
"runtime/debug"
"strconv"
"sync"
"time"
"github.com/godbus/dbus/v5"
"github.com/linuxdeepin/go-lib/dbusutil"
"github.com/msteinert/pam"
)
const (
PromptQuestion uint32 = iota + 1
PromptSecret
ErrorMsg
TextInfo
Failure
Success
)
//go:generate dbusutil-gen em -type Manager
type Manager struct {
service *dbusutil.Service
authLocker sync.Mutex
authUserTable map[string]chan string // 'pid+user': 'password'
signals *struct { //nolint
Event struct {
eventType uint32
pid uint32
username string
message string
}
UserChanged struct {
username string
}
}
}
const (
dbusServiceName = "org.deepin.dde.LockService1"
dbusPath = "/org/deepin/dde/LockService1"
dbusInterface = "org.deepin.dde.LockService1"
)
var _m *Manager
func init() {
log.SetFlags(log.Lshortfile)
}
func main() {
service, err := dbusutil.NewSystemService()
if err != nil {
log.Fatal("failed to new system service:", err)
}
_m = newManager(service)
err = service.Export(dbusPath, _m)
if err != nil {
log.Fatal("failed to export:", err)
}
err = service.RequestName(dbusServiceName)
if err != nil {
log.Fatal("failed to request name:", err)
}
service.SetAutoQuitHandler(time.Minute*2, func() bool {
_m.authLocker.Lock()
canQuit := len(_m.authUserTable) == 0
_m.authLocker.Unlock()
return canQuit
})
service.Wait()
}
func (*Manager) GetInterfaceName() string {
return dbusInterface
}
func newManager(service *dbusutil.Service) *Manager {
var m = Manager{
authUserTable: make(map[string]chan string),
service: service,
}
return &m
}
func (m *Manager) CurrentUser() (username string, busErr *dbus.Error) {
username, err := getGreeterUser(greeterUserConfig)
if err != nil {
return "", dbusutil.ToError(errors.New("get greeter user failed"))
}
return username, nil
}
func (m *Manager) IsLiveCD(username string) (result bool, busErr *dbus.Error) {
return isInLiveCD(username), nil
}
func (m *Manager) SwitchToUser(username string) *dbus.Error {
current, _ := getGreeterUser(greeterUserConfig)
if current == username {
return nil
}
err := setGreeterUser(greeterUserConfig, username)
if err != nil {
return dbusutil.ToError(errors.New("set greeter user failed"))
}
if current != "" {
err = m.service.Emit(m, "UserChanged", username)
if err != nil {
return dbusutil.ToError(err)
}
}
return nil
}
func (m *Manager) AuthenticateUser(sender dbus.Sender, username string) *dbus.Error {
if username == "" {
return dbusutil.ToError(fmt.Errorf("no user to authenticate"))
}
m.authLocker.Lock()
pid, err := m.service.GetConnPID(string(sender))
if err != nil {
return dbusutil.ToError(err)
}
id := getId(pid, username)
_, ok := m.authUserTable[id]
if ok {
log.Println("In authenticating:", id)
m.authLocker.Unlock()
return nil
}
m.authUserTable[id] = make(chan string, 1)
m.authLocker.Unlock()
go m.doAuthenticate(username, "", pid)
return nil
}
func (m *Manager) UnlockCheck(sender dbus.Sender, username, password string) *dbus.Error {
if username == "" {
return dbusutil.ToError(fmt.Errorf("no user to authenticate"))
}
pid, err := m.service.GetConnPID(string(sender))
if err != nil {
return dbusutil.ToError(err)
}
id := getId(pid, username)
m.authLocker.Lock()
v, ok := m.authUserTable[id]
if ok && v != nil {
log.Println("In authenticating:", id)
// in authenticate
v <- password
m.authLocker.Unlock()
return nil
}
m.authLocker.Unlock()
go m.doAuthenticate(username, password, pid)
return nil
}
func getId(pid uint32, username string) string {
return strconv.Itoa(int(pid)) + username
}
func (m *Manager) doAuthenticate(username, password string, pid uint32) {
handler, err := pam.StartFunc("lightdm", username, func(style pam.Style, msg string) (string, error) {
switch style {
// case pam.PromptEchoOn:
// if msg != "" {
// fmt.Println("Echo on:", msg)
// m.sendEvent(PromptQuestion, pid, username, msg)
// }
// // TODO: read data from input
// return "", nil
case pam.PromptEchoOff, pam.PromptEchoOn:
if password != "" {
tmp := password
password = ""
return tmp, nil
}
if msg != "" {
if style == pam.PromptEchoOff {
log.Println("Echo off:", msg)
m.sendEvent(PromptSecret, pid, username, msg)
} else {
log.Println("Echo on:", msg)
m.sendEvent(PromptQuestion, pid, username, msg)
}
}
id := getId(pid, username)
m.authLocker.Lock()
v, ok := m.authUserTable[id]
m.authLocker.Unlock()
if !ok || v == nil {
log.Println("WARN: no password channel found for", username)
return "", fmt.Errorf("no passwd channel found for %s", username)
}
log.Println("Join select:", id)
tmp, ok := <-v
if !ok {
log.Println("Invalid select channel")
return "", nil
}
m.authLocker.Lock()
delete(m.authUserTable, id)
close(v)
m.authLocker.Unlock()
return tmp, nil
case pam.ErrorMsg:
if msg != "" {
log.Println("ShowError:", msg)
m.sendEvent(ErrorMsg, pid, username, msg)
}
return "", nil
case pam.TextInfo:
if msg != "" {
log.Println("Text info:", msg)
m.sendEvent(TextInfo, pid, username, msg)
}
return "", nil
}
return "", fmt.Errorf("unexpected style: %v", style)
})
if err != nil {
log.Println("Failed to start pam:", err)
m.sendEvent(Failure, pid, username, err.Error())
return
}
// meet the requirement of pam_unix.so nullok_secure option,
// allows any user with a blank password to unlock.
err = handler.SetItem(pam.Tty, "tty1")
if err != nil {
log.Println("WARN: failed to set item tty:", err)
}
err = handler.Authenticate(0)
id := getId(pid, username)
m.authLocker.Lock()
v, ok := m.authUserTable[id]
if ok {
close(v)
delete(m.authUserTable, id)
}
m.authLocker.Unlock()
if err != nil {
log.Println("Failed to authenticate:", err)
m.sendEvent(Failure, pid, username, err.Error())
} else {
log.Println("Authenticate success")
m.sendEvent(Success, pid, username, "Authenticated")
}
handler = nil
debug.FreeOSMemory()
}
func (m *Manager) sendEvent(ty, pid uint32, username, msg string) {
err := m.service.Emit(m, "Event", ty, pid, username, msg)
if err != nil {
log.Println("Failed to emit event:", ty, pid, username, msg)
}
}